My husbands get sick usually every Monday. This is his day off so it's not work related. He says it starts with belching something that tastes terrible and is followed by vomiting and sometimes diaharia. His doctor told him it could be something souring on his stomach. This has been going on for about a year and seems to be getting worse. He is better by late afternoon of the same day. He also has dentures and usually eats without them. His doctor also said he might not be chewing his food well enough. If that was the case wouldn't he be sick more often?

How much does he drink? Sounds to me like a classic hangover.